Sullair LS-20S Operator's Manual And Parts List page 20

Section 2
DESCRIPTION
sor II energizes the solenoid valve allowing the air
pressure behind the Sullicon Control and the spiral
valve actuator to be vented through the solenoid
valve exhaust port. The blowdown valve closes, the
inlet butterfly valve opens. Also the spiral valve re-
turns to the full load (maximum) position.
2.7 AIR INLET SYSTEM, FUNCTIONAL DESCRIP-
TION
Ref er t o F igure 2-6. T he compressor inlet syst em
14
consists of a two- -stage, heavy- -duty, dry- -type
filter with inertial dust separation and collection, a
butterfly- -type air inlet valve, and an adaptor
piece which mounts both devices to the compres-
sor inlet flange.
When the pressure drop across the filter element(s)
exceeds a level of 15 in. of water column, a switch
contact opens in the Supervisor II module and a filter
maintenance annunciation is displayed.